导入物料BUG修改

mhd_wms/src/main/java/com/mhd/wms/application/service/materialBaseInfo/MaterialBaseInfoApplicationService.java

@@ -457,7 +457,7 @@ public class MaterialBaseInfoApplicationService {
             throw new ServiceException("请上传xls或xlsx格式文件");
         }
 
-        // 保存文件到临时目录
+        // 流式写入临时文件，避免大文件 getBytes() 导致内存溢出和接口超时
         String tmpDir = System.getProperty("java.io.tmpdir") + File.separator + "material_import";
         File dir = new File(tmpDir);
         if (!dir.exists()) {
@@ -465,8 +465,8 @@ public class MaterialBaseInfoApplicationService {
         }
         String tmpFileName = System.currentTimeMillis() + "_" + fileName;
         File tmpFile = new File(dir, tmpFileName);
-        try (FileOutputStream fos = new FileOutputStream(tmpFile)) {
-            fos.write(file.getBytes());
+        try {
+            file.transferTo(tmpFile);
         } catch (Exception e) {
             throw new ServiceException("文件保存失败：" + e.getMessage());
         }